Originally Posted by 22point8
Black optimiser doesn't make a huge visible difference but it does make a big contrast ratio difference.
These numbers are a bit old now that I discovered the TV can do 160cdm2.
Off) 120/0.008= 15000:1
Dark Room) 120/0.0068= 17647:1
Bright Room) 148/0.008= 18500:1
Auto) 145/0.0068= 21323:1
Auto uses the light sensor on the front of the TV to decide whether to use Dark Room+ more light output or Bright Room.
It also expands the 16-235 range to maximise graduation.
How much light is falling on the screen? The phosphors will reflect light back making it look grey (Like a CRT).
There's no light reflecting on the front of the screen, just a bias light behind the screen and black out blinds.
I've got quite an eye for detail, usually spotting minor things that no one else would see, and I can literally see nothing different between the modes on the black levels.
Even on a movie with black bars it shows no difference, my main concern at this stage was purely the mll as opposed to the bigger contrast ratio.
The reason for my "concern" was incase the set is faulty, I guess the only way I'll know is by bringing my meter round to take measurements, but in the meantime I was wondering if it was visible by eye.
As I mentiond earlier even if I turn off the bias light behind the screen and look at a full screen 0IRE slide and flick through dark room, and off I see nothing at all.
Going by your recorded measurements I'd have expected the mll difference to be visible by eye, or at least the scan lines to be visible when enabling black optimiser. I'm sure I read that scan lines were visible as the mll got lower due to the panel being driven differently, but as I said I can't discern any change whatsoever with the different options.